The Oulad Ouaslam Variscan granitic pluton (Jebilets Massif,Southwestern Moroccan Meseta): A forcibly emplaced laccolithic intrusion characterized by its magnetic and magmatic fabrics |
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| Institution: | 1. Université Cadi Ayyad, Département de Géologie, Bd. Prince Moulay Abdellah, BP 2390, Marrakech, Morocco;2. CNRS, Université Paul-Sabatier and IRD, LMTG, UMR 5563, Equipe de Géodynamique, 14 Avenue Edouard Belin, 31400 Toulouse, France;1. LAGAGE, Ibn Zohr University, Agadir, Morocco;2. EDYTEM, Université de Savoie- Mont Blanc, CNRS, F 73376, Le Bourget du Lac Cedex, France;3. Geodynamics and Mineral Resources, Royal Museum for Central Africa, B-3080 Tervuren, Belgium;4. Kanazawa University, Department of Earth Sciences, Kanazawa, Japan;5. Department of Geology, Faculty of Science, Assiut University, Assiut 71516, Egypt;6. Faculty of Earth Sciences, King Abdul-Aziz University, Jeddah, Saudi Arabia;7. Department of Geology and Geophysics, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;1. Department of Fundamental & Applied Geology – Mining Geology, Université de Mons, 20, Place du Parc, B-7000, Belgium;2. Laboratoire de Planétologie et Géodynamique – Nantes (LPGN), UFR Sciences et Techniques, Université de Nantes, UMR-CNRS 6112, 2, Rue de la Houssinière, BP92208, 44322 Nantes Cedex 3, France;3. Géosciences Environnement Toulouse (GET), Observatoire de Midi-Pyrénées, CNRS, IRD, Université de Paul Sabatier, UMR-CNRS 5563, 14, Avenue Edouard Belin, 31400 Toulouse, France;4. EGGPG, Département de Géologie, Faculté des Sciences, BP. 20; Université Chouaïb Doukkali, 24000 El Jadida, Morocco;5. Instituo de Ciencas Ambientales & Evolutivas (ICAEV), Facultad de Ciencas, Universidad Austral de Chile (UACh), 641, Independencia, Valdivia, Chile;6. Géosciences Montpellier, Université de Montpellier 2, UMR-CNRS 5243, Place E. Bataillon, 34095 Montpellier-Cedex, France;7. Terre et Histoire de la Terre, Institut Royal des Sciences Naturelles de Belgique, 29, Rue Vautier, B-1000 Bruxelles, Belgium;1. Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA;2. Department of Geosciences, Environment and Society (DGES), Laboratoire G-Time, Université Libre de Bruxelles (ULB), Avenue Franklin Roosevelt, 50 (CP160/02), 1050 Brussels, Belgium;3. Géosciences Environnement Toulouse (GET), Université de Toulouse, CNRS, IRD, Université de Paul Sabatier, UMR-CNRS 5563, 14, Avenue Edouard Belin, 31400 Toulouse, France;4. Department of Geology and Applied Geology, Université de Mons, 20, Place du Parc, B-7000, Belgium;5. Faculty of Geology and Geophysics, University of Bucharest, 010041 Bucharest, Romania;6. Goldspot Discoveries Inc., 69 Yonge Street Suite 1010, Toronto, Canada;7. Department of Earth Sciences, Syracuse University, Syracuse, NY 13244, USA;8. EGGPG, Département de Géologie, Faculté des Sciences, Université Chouaïb Doukkali, 24000 El Jadida, Morocco;1. BRGM, BP 6009, 45060 Orléans Cédex, France;2. Geology Department, Faculty of Sciences-Semlalia, Cadi Ayyad University, PO Box 2390, 40000 Marrakech, Morocco;3. Laboratoire EDYTEM, Université de Savoie, CNRS, Campus Scientifique, 73376 Le Bourget du Lac Cedex, France;4. EGID, Université de Bordeaux 3, 33607 Pessac Cedex, France;5. GEODE Terre et Patrimoine, B.P. 7004, 40014 Marrakech, Morocco;6. Universidade de Lisboa, Faculdade de Ciências, Departamento de Geologia, Centro de Geologia, Portugal;1. Geology Department, Faculty of Sciences, Moulay Ismail University, P.O. Box 11201 Zitoune, Meknès, Morocco;2. Instituto Andaluz de Ciencias de la Tierra, Consejo Superior de Investigaciones Científicas–Universidad de Granada, Avenida de las Palmeras 4, 18100 Armilla, Granada, Spain;3. Dipartimento di Geoscienze, Università di Padova, Padova 35131, Italy;4. Géosciences Montpellier, Université de Montpellier, 2, CNRS, Cc 60, Place Eugène Bataillon, 34095 Montpellier Cedex 05, France;5. Departamento de Mineralogía y Petrología, Facultad de Ciencias, Universidad de Granada, Avenida Fuentenueva s/n, 18002 Granada, Spain |
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| Abstract: | The study of the magmatic fabrics of the Oulad Ouaslam Variscan granitic pluton, based on the Anisotropy of Magnetic Susceptibility technique, allows us to propose that this 30 km long laccolith corresponds to a forcibly emplaced intrusion which proceeded from west to east into its country rock of Carboniferous metapelites. The fact that the magmatic fabrics measured in this pluton are obliquely cut, in the southwestern part, by solid-state structures (cleavage, shear bands) related to the regional main phase of deformation shows that the pluton was emplaced before this phase. Consequently, the tectonic control of this emplacement appears to have been much less important than it was suggested in the previous interpretations which considered, on the basis of the study of the solid-state fabrics, a syn-tectonic emplacement of this granite, possibly linked to a sinistral NNW–SSE shear zone. Our results contribute to the definition of a new framework for the tectonic history of this part of the Variscan chain. |
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